vsvim call to function not supported

Question

I wrote a function in my vimrc file:

function! InsertDebugBlock()
    call append(line('.'), [", "])
    call setline(line('.') + 1, '#if DEBUG')
    call setline(line('.') + 2, '#endif')
    normal j
    startinsert
endfunction

however, when I called it via vsvim in visual studio, it said:

call to function InsertDebugBlock not supported

but it works well with gvim

here are some configurations in vsvim

it says my vimrc file is "C:\Users\Deler\vimfiles\_vimrc", and that's what it is.

I can't find the problem. My vsvim version is 2.8.0.0, visual studio 2019

Answer 1

VsVim is not Vim so there is no reason whatsoever to expect anything from Vim to work in VsVim and vice-versa.

Case in point: here is the very limited subset of features supported by VsVim and here is the (very reasonable) rationale for not supporting vimscript.

Preliminary conclusion: VsVim doesn't support vimscript so there is no way to make your snippet work.

Now… as-is, your function can't do what you claim it to do in Vim anyway. It actually produces this when called with the cursor on foo:

foo
|#if DEBUG    # cursor before #if
#endif

Besides, using setline() the way you do anywhere else than the end of the buffer will inevitably result in loss of data:

# before
foo
bar
baz
quux

# after
foo
#if DEBUG    # oops! where is bar?
#endif
baz
quux

Not good.

Here is a simpler implementation that is guaranteed to work in Vim and, judging by the linked resources, is very likely to also work in VsVim:

nnoremap <key> o#ifdef DEBUG<CR>#endif<Esc>O

Use whatever <key> you want.